blueprint process

9 examples
(0.02 sec)

By the latter 1890s in American architectural offices, a blueprint was one-tenth the cost of a hand-traced reproduction.The blueprint process is still used for special artistic and photographic effects, on paper and fabrics.Traditional blueprints have largely been replaced by more modern, less expensive printing methods and digital displays.…

Reproductions must be accurate as to size and shape, but for many purposes need not be permanent.The blueprint process was first used for mechanical reproduction of drawings.Drawing offices may use diazo or whiteprint processes.…

Engineers and architects drew their designs on cartridge paper; these were then traced on to tracing paper using Indian ink for reproduction whenever needed.Introduction of the blueprint process eliminated the expense of photolithographic reproduction or of hand-tracing of original drawings.By the latter 1890s in American architectural offices, a blueprint was one-tenth the cost of a hand-traced reproduction.…

The light-sensitivity of the chemicals used was known in the 1890s and several related printing processes were patented at that time.Whiteprinting replaced the blueprint process for reproducing architectural and engineering drawings because the process was simpler and involved fewer toxic chemicals.A blue-line print is not permanent and will fade if exposed to light for weeks or months, but a drawing print that lasts only a few months is sufficient for many purposes.…

The ink may be revealed by heat or by application of an appropriate chemical, or it may be made visible by viewing under ultraviolet light.Inks which are developed by a chemical reaction may depend on an acid-base reaction (like litmus paper), reactions similar to the blueprint process, or any of hundreds of others.Developer fluids may be applied using a spray bottle, but some developers are in the form of vaporous, e.g. ammonia fumes used to develop phenolphthalein ink.…

This same process, using an intermediary reprographic drawing, could also be used to produce a positive blueprint -- blue lines on a white ground -- however, this more expensive and time-intensive method was far less commonly employed.The major disadvantages of the blueprint process, however, included paper distortions caused by the wet process which might render scale drawings less accurately, as well as the inability to make further copies from the blueprints.Nonetheless, for its efficiency and low cost, the blueprint process, further simplified and mechanized by the turn of the 20th century, became the most widely used reprographic process between the mid-19th century and the latter half of the 20th-century.…

To make a Pellet print, a paper (or more rarely drafting linen) support is coated with ferric salts suspended in a gelatin emulsion, placed under a translucent original drawing, weighted with glass, and exposed to ultraviolet light.As with the blueprint process, after sufficient light exposure, the original drawing is removed, the paper washed in a ferrocyanide bath, and then rinsed in an acidic bath to reveal a positive image.This process required fewer steps than creating a positive blueprint, and was thus more widely employed during the late 19th and early 20th centuries.…

The major disadvantages of the blueprint process, however, included paper distortions caused by the wet process which might render scale drawings less accurately, as well as the inability to make further copies from the blueprints.Nonetheless, for its efficiency and low cost, the blueprint process, further simplified and mechanized by the turn of the 20th century, became the most widely used reprographic process between the mid-19th century and the latter half of the 20th-century.In archival settings, because the process involves ammonium, the resulting prints should not be stored in contact with other papers that have a buffered reserve, nor should blueprints be de-acidified, as the resulting chemical interactions can cause irreversible image loss.…

From 1877 to 1972, Unilever used only the coloring produced by the Venlo factory in its margarine.In 1919 the grandson of Lodewijk, Louis van der Grinten, became interested in the blueprint process used for producing wide-format technical drawings, used in construction, manufacturing, etc.At that time, blueprint paper was extremely light-sensitive, and therefore had a very short shelf life before being used.…